An MS patient can feel fine for years without being affected much by____________
What does Cindy think of the difficult times she has gone through？
A. It gave the couple and their kids a tough lesson.
B. It left a lasting psychological impact on the family.
C. It would come again and affect the family.
D. It gave her confidence and optimism.
正确答案是（）
A. accidents
B. incidents
C. occasions
D. events
下列物质中，与乙酸甲酯互为同分异构体的是（）
A. 乙酸乙酯
B. 丁酸
C. 丙醇
D. 甲酸乙酯
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